In most circumstances the livecd will pick up an IP by itself if DHCP is available on the network.
With regards to ssh that should be in the handbook but i don't recall at this particular moment.
Anyhow, it would be setting root's password and just starting the old fashined gentoo way "/etc/init.d/sshd start" - no more, no less._________________Gustavo Zacarias
Gentoo/SPARC monkey